| /* |
| * Copyright 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.media; |
| |
| import android.annotation.NonNull; |
| import android.os.ParcelFileDescriptor; |
| import android.util.Log; |
| |
| import java.io.IOException; |
| |
| /** |
| * Structure of data source descriptor for sources using file descriptor. |
| * |
| * Used by {@link MediaPlayer2#setDataSource}, {@link MediaPlayer2#setNextDataSource} and |
| * {@link MediaPlayer2#setNextDataSources} to set data source for playback. |
| * |
| * <p>Users should use {@link Builder} to create {@link FileDataSourceDesc}. |
| * @hide |
| */ |
| public class FileDataSourceDesc extends DataSourceDesc { |
| private static final String TAG = "FileDataSourceDesc"; |
| |
| /** |
| * Used when the length of file descriptor is unknown. |
| * |
| * @see #getLength() |
| */ |
| public static final long FD_LENGTH_UNKNOWN = LONG_MAX; |
| |
| private ParcelFileDescriptor mPFD; |
| private long mOffset = 0; |
| private long mLength = FD_LENGTH_UNKNOWN; |
| private int mCount = 0; |
| private boolean mClosed = false; |
| |
| FileDataSourceDesc(String mediaId, long startPositionMs, long endPositionMs, |
| ParcelFileDescriptor pfd, long offset, long length) { |
| super(mediaId, startPositionMs, endPositionMs); |
| mPFD = pfd; |
| mOffset = offset; |
| mLength = length; |
| } |
| |
| /** |
| * Releases the resources held by this {@code FileDataSourceDesc} object. |
| */ |
| @Override |
| void close() { |
| super.close(); |
| decCount(); |
| } |
| |
| /** |
| * Decrements usage count by {@link MediaPlayer2}. |
| * If this is the last usage, also releases the file descriptor held by this |
| * {@code FileDataSourceDesc} object. |
| */ |
| void decCount() { |
| synchronized (this) { |
| --mCount; |
| if (mCount > 0) { |
| return; |
| } |
| |
| try { |
| mPFD.close(); |
| mClosed = true; |
| } catch (IOException e) { |
| Log.e(TAG, "failed to close pfd: " + e); |
| } |
| } |
| } |
| |
| /** |
| * Increments usage count by {@link MediaPlayer2} if PFD has not been closed. |
| */ |
| void incCount() { |
| synchronized (this) { |
| if (!mClosed) { |
| ++mCount; |
| } |
| } |
| } |
| |
| /** |
| * Return the status of underline ParcelFileDescriptor |
| * @return true if underline ParcelFileDescriptor is closed, false otherwise. |
| */ |
| boolean isPFDClosed() { |
| synchronized (this) { |
| return mClosed; |
| } |
| } |
| |
| /** |
| * Return the ParcelFileDescriptor of this data source. |
| * @return the ParcelFileDescriptor of this data source |
| */ |
| public @NonNull ParcelFileDescriptor getParcelFileDescriptor() { |
| return mPFD; |
| } |
| |
| /** |
| * Return the offset associated with the ParcelFileDescriptor of this data source. |
| * It's meaningful only when it has been set by the {@link Builder}. |
| * @return the offset associated with the ParcelFileDescriptor of this data source |
| */ |
| public long getOffset() { |
| return mOffset; |
| } |
| |
| /** |
| * Return the content length associated with the ParcelFileDescriptor of this data source. |
| * {@link #FD_LENGTH_UNKNOWN} means same as the length of source content. |
| * @return the content length associated with the ParcelFileDescriptor of this data source |
| */ |
| public long getLength() { |
| return mLength; |
| } |
| } |